Evaluation of safety parameters of the motor grader during maneuvering in the street and road network

Abstract

Introduction. The article is devoted to improving the safety of operation of motor graders in urban conditions. The paper considers analytical methods for evaluating the influence of structural, geometric and kinematic characteristics of the motor grader on the safety of maneuvering in urban conditions for u-turns and turns at the intersections of the road network.Problem Statement. In the course of the study, it is necessary to establish safe values of kinematic and geometric parameters for maneuvering of motor graders with articulated frames in urban conditions.Theoretical Part. The numerical estimates were made based on the technical characteristics of three types of articulated frame graders. We consider possible options for moving the grader out of the street or roadway when making a "right" or "left" turn at a road intersection to avoid the situation of moving the grader out of the street or roadway. The calculation scheme for determining the parameters of the motor grader's turn is constructed. The calculation formulas for the external and internal overall turning radii of the grader and the overall traffic corridor are obtained. This allows you to determine the minimum width of the roadway for safe maneuvering of the motor grader. The value of the required safe minimum turning radius of the motor grader for a given width of the roadway is determined. All calculation formulas are obtained for the general case when the trajectories of the rear and front wheels do not coincide. It is shown that when turning the motor grader, the most dangerous is the radius of the front dimensions, determined by the extreme points of the front bulldozer blade. The radius of the rear dimensions in this case can be ignored, because it is of negligible importance. If you make a u-turn at an intersection, you can take the grader blade out of the roadway. The maximum radius is determined by the size of the blade that goes beyond the width of the grader.Conclusion. The obtained solutions can be used to determine safe maneuvering modes for motor graders in urban conditions.

Keywords

• motor grader
• maneuverability
• radius of turn
• rotatability